Dockerfile

FROM python:3.8.12-alpine as builder

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

WORKDIR /usr/src/app

RUN apk update \
    && apk add --virtual build-deps gcc python3-dev musl-dev \
    && apk add postgresql \
    && apk add postgresql-dev \
    && apk add jpeg-dev zlib-dev libjpeg

RUN pip install --upgrade pip
COPY ./requirements-prod.txt .
RUN pip wheel --no-cache-dir --no-deps --wheel-dir /usr/src/app/wheels -r requirements-prod.txt

############################

FROM python:3.8.12-alpine

RUN addgroup --gid 1017 django_g && adduser django -S  --disabled-password --ingroup django_g

ENV APP_DIR=/usr/src/app
WORKDIR $APP_DIR

RUN apk update && apk add libpq libjpeg
COPY --from=builder /usr/src/app/wheels /wheels
COPY --from=builder /usr/src/app/requirements-prod.txt .
RUN pip install --no-cache /wheels/*

ENV GOSU_VERSION 1.12
RUN set -eux; \
	\
	apk add --no-cache --virtual .gosu-deps \
		ca-certificates \
		dpkg \
		gnupg \
	; \
	\
	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
	wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
	\
# verify the signature
	export GNUPGHOME="$(mktemp -d)"; \
	gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
	gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
	command -v gpgconf && gpgconf --kill all || :; \
	rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
	\
# clean up fetch dependencies
	apk del --no-network .gosu-deps; \
	\
	chmod +x /usr/local/bin/gosu; \
# verify that the binary works
	gosu --version; \
	gosu nobody true

COPY . .

RUN mkdir -p media static

ENTRYPOINT ["/usr/src/app/scripts/entrypoint.sh"]